{"product_id":"value-collection-zmschb90239-o-ring-dash-8-239-nbr","title":"Value Collection ZMSCHB90239 O-ring Dash 8-239 Nbr","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION ZMSCHB90239 is a rectangular-cross-section backup O-ring made from Nitrile Butadiene Rubber (NBR), designed to prevent extrusion in hydraulic and pneumatic sealing applications. It carries a Dash 8-239 designation and measures 3.631 inches inner diameter by 3.867 inches outer diameter with a thickness of 0.0468 inches. At 90 durometer, this extra-hard ring provides firm support behind a primary O-ring under pressure, holding the seal in place and extending service life. It is installed by maintenance technicians, hydraulic system specialists, and plumbing professionals working on equipment subject to fluid or gas pressure cycling.\u003c\/p\u003e\n\u003cp\u003eThis backup ring suits residential and commercial applications wherever a Dash 8-239 backup ring is specified, including hydraulic cylinders, pneumatic actuators, fluid fittings, and valve assemblies. Its NBR compound handles a broad range of petroleum-based fluids, water, and general-purpose gases. The wide temperature range of -40 to 250 degrees F makes it suitable for both cold-climate outdoor equipment and moderate-heat process systems. Each order unit contains 10 rings, and the minimum order quantity is 1 unit.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eRectangular cross section functions as a backup ring to resist extrusion of primary O-ring seals under pressure\u003c\/li\u003e\n  \u003cli\u003eNitrile Butadiene Rubber (NBR) compound compatible with petroleum-based fluids, water, and general-purpose gases\u003c\/li\u003e\n  \u003cli\u003e90 durometer extra-hard rating provides firm lateral support in high-pressure groove configurations\u003c\/li\u003e\n  \u003cli\u003eOperating temperature range of -40 to 250 degrees F suits a wide variety of service environments\u003c\/li\u003e\n  \u003cli\u003eDash 8-239 designation allows direct cross-reference to standard O-ring sizing charts\u003c\/li\u003e\n  \u003cli\u003ePackaged in quantities of 10 rings per unit for bench stock and service kit replenishment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard Dash 8-239 backup ring for use in hydraulic, pneumatic, and fluid-sealing assemblies that specify an NBR rectangular backup ring with a 3.631-inch inner diameter and 0.0468-inch thickness. Not FDA approved; not intended for food-contact or pharmaceutical applications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eBackup rings are typically installed by hydraulic technicians or plumbers during seal kit replacement with the system fully depressurized and the fluid supply isolated. Inspect the groove dimensions before installation to confirm the backup ring seats flush without distortion. Avoid using sharp tools that can nick the rubber, as surface damage reduces sealing effectiveness. Follow the equipment manufacturer's torque specifications and applicable codes when reassembling fittings and housings.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 3.631 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 3.867 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.0468 inches (3\/64 inch nominal)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCross Section Shape\u003c\/strong\u003e: Rectangle\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Nitrile Butadiene Rubber (NBR)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDash Number\u003c\/strong\u003e: 8-239\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardness\u003c\/strong\u003e: 90 durometer (Extra Hard)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Working Temperature\u003c\/strong\u003e: -40 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Working Temperature\u003c\/strong\u003e: 250 degrees F\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFDA Approved\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 10 rings per unit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31401503\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: VALUE COLLECTION\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: ZMSCHB90239\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51716234608946,"sku":"ZMSCHB90239","price":15.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/bbbcceebcc98f31c0d76bce29370f44a_efa1e5b8-428c-49a1-8755-6ea2d8329249.jpg?v=1788523469","url":"https:\/\/voomisupply.com\/products\/value-collection-zmschb90239-o-ring-dash-8-239-nbr","provider":"Voomi Supply","version":"1.0","type":"link"}